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ludmilkaskok [199]
3 years ago
12

I dont think I can write this out via phone; any help?

Mathematics
2 answers:
melomori [17]3 years ago
6 0

Answer:

2

Step-by-step explanation:

(4)(2)+4

-------------

(2)(4)−2

Replace x and y with the numbers

(4)(2) + 4 = 12

(2)(4) - 2 = 6

12/6 = 2

therefore answer is 2

Georgia [21]3 years ago
6 0

Answer:

2

Step-by-step explanation:

x=2 y=4

4x + y /2y - x

4(2) + 4 / 2(4) - (2)

8 + 4 / 8 - 2

12 / 6

2

Brainliest is appreciated

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What is the simplified form of the quantity of x plus 7, all over the quantity of x plus 3 + the quantity of x minus 4, all over
enyata [817]
Break down the words into an equation:
(x+7)/(x+3) + (x-4)/3



3 0
3 years ago
What does​ Descartes' rule of signs tell you about the possible number of positive real zeros and the possible number of negativ
Sergio039 [100]

Answer:

  • 3 or 1 positive real zeros
  • 0 negative real zeros

Step-by-step explanation:

The signs of the coefficients of the given terms are ...

  +  -  +  -

There are three sign changes, so the number of positive real zeros is 3 or 1.

When odd-degree terms have their signs changed, the signs become ...

  -  -  -  -

There are no sign changes, hence no negative real zeros.

_____

A graph confirms this evaluation.

8 0
3 years ago
John bikes at a speed of 10 miles per hour
mihalych1998 [28]

Answer:

15 miles

Step-by-step explanation:

10x1.5=15

3 0
2 years ago
Read 2 more answers
A researcher finds that of 1000 people who said that they attend a religious service at least once a week, A stopped to help a p
Ne4ueva [31]

Answer:

There is enough evidence to support the claim that the proportions are not equal. (P-value: 0.048).

Step-by-step explanation:

The question is incomplete:

<em>"A researcher finds that of 1000 people who said that they attend a religious service at least once a week, 31 stopped to help a person with car trouble. Of 1200 people interviewed who had not attended a religious service at least once a month, 22 stopped to help a person with car trouble. At the 0.05 significance level, test the claim that the two proportions are different."</em>

This is a hypothesis test for the difference between proportions.

The claim is that the proportions are not equal.

Then, the null and alternative hypothesis are:

H_0: \pi_1-\pi_2=0\\\\H_a:\pi_1-\pi_2\neq 0

The significance level is 0.05.

The sample 1, of size n1=1000 has a proportion of p1=0.031.

p_1=X_1/n_1=31/1000=0.031

The sample 2, of size n2=1200 has a proportion of p2=0.018.

p_2=X_2/n_2=22/1200=0.018

The difference between proportions is (p1-p2)=0.013.

p_d=p_1-p_2=0.031-0.018=0.013

The pooled proportion, needed to calculate the standard error, is:

p=\dfrac{X_1+X_2}{n_1+n_2}=\dfrac{31+22}{1000+1200}=\dfrac{53}{2200}=0.024

The estimated standard error of the difference between means is computed using the formula:

s_{p1-p2}=\sqrt{\dfrac{p(1-p)}{n_1}+\dfrac{p(1-p)}{n_2}}=\sqrt{\dfrac{0.024*0.976}{1000}+\dfrac{0.024*0.976}{1200}}\\\\\\s_{p1-p2}=\sqrt{0+0}=\sqrt{0}=0.007

Then, we can calculate the z-statistic as:

z=\dfrac{p_d-(\pi_1-\pi_2)}{s_{p1-p2}}=\dfrac{0.013-0}{0.007}=\dfrac{0.013}{0.007}=1.98

This test is a two-tailed test, so the P-value for this test is calculated as (using a z-table):

P-value=2\cdot P(z>1.98)=0.048

As the P-value (0.048) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the proportions are not equal.

6 0
3 years ago
Please help! Very confused,
Alex777 [14]
The answer is probably c
8 0
3 years ago
Read 2 more answers
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